Not a ballpark number: Steve Whitzman collected 31,403 different Expos cards and they're for sale
Its a pure nostalgia play aimed at tapping into the brains of people who first got into the Pokmon trading card game as kids when it started, have probably since fallen off, and now have nieces, nephews, or kids of their own, and enough disposable income to be willing to spend money to relive their childhood glory days, or at least get back that beloved foil card they lost, traded away, or had stolen back in the 90s
The ideal gameplan for the archetype is to have a high-damage dealing Pokmon like Articuno ex up front, then snipe at your opponent with a Greninja (or two if you're living the dream) that's waiting in the wings
Mark Heggen, MTGs Product Designer, had this to say about the new Post Malone set: Post is helping us celebrate 30 years of Magic, and that includes this Secret Lair
Since this card is just a Clone effect at the end of the day, players might not always be willing to pay so much for it